Device for packing concrete in molds.



H. G. ROUNDS.

DEVIGE FOR PACKING CONCRETE IN MOLDS.

APPLICATION FILED APR.5. 1912.

Patented Dec. 17, 1912.

/////////l////lll///////l/////////{//I/lll/YLLlI/Il/lIIIIIJ/IIIII/IIIIIIIIIIII fT /IIII/IIIIIIIIIII/IlIIIIIIIIIIII////////li/l///./]/////////////////////////// ///'//fl//////////////////7////////////////////////lllllllilfi/k/l/l/I WITNESSES: mmawswm.

ruummm vLANuqn/um cu., WASHINGTON, u. c.

NVENTOR ATTORNEY IFFICE.

HERBERT G. ROUNDS, OF BAY CITY, MICHIGAN.

DEVICE FOR PACKING CONCRETE IN MOLDS.

Specification of Letters Patent.

Patented Dec. 17, 1912.

Application filed April 5, 1912. Serial No. 688,672.

To all whom it may concern:

Be it known that I, HERBERT G. RoUNDs, a citizen of the United States,residing at Bay City, in the county of Bay and State of Michigan, haveinvented certain new and useful Improvements in Devices for PackingConcrete in Molds; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to apparatus for manufacturing cement blocks andthe like, in which a hole or cavity is to be left in the completedblock.

The objects of my invention are to provide a pressing piece or head incombination with a mold, the head being adapted to rotate, and whilerotating to be forced through an opening in the top of the mold and downinto the material, displacing the material and forcing it outward andupward so as to pack it in all directions and completely fill thecorners of the mold.

A further object is to provide a head of the class described which shallbe adapted to pass clear through the material to the bottom of the moldand to scrape the material from the bottom so as to form a smooth, cleanhole extending clear through the finished block.

WVith these and certain other objects in view which will appear later inthe specification, my invention consists in the devices described andclaimed, and in the equivalents thereof.

I11 the drawings, Figure 1 is a sectional view of a mold showing thehead in its operating position; Fig. 2 is a perspective View partly insection of the underside of the head; and Fig. 3 is a bottom plan Viewof the head.

1 represents the mold, the top and bottom of which are preferably heldby clamps 2. An opening 3 in the top of the mold is provided throughwhich the head 4: passes.

5 is the spindle by which the head is rotated and forced into the mold.A cylindrical shell 6 is carried by the head and is preferably formedintegral with it, the shell being slightly tapered upwardly andoutwardly. The lower surfaces 7 of the head, which I term the pressingsurfaces, are inclined upwardly and outwardly.

8, -8 are downwardly projecting curved wings carried by the pressingsurfaces and preferably formed integral with the head 4. The outer wallsof the curved wings are vertical, the inner walls being beveled so as tomake the wings thicker at their conjunction with the head 4 than attheir lower edges. The lower edges 9 of the wings are all in the sameplane at right angles to the axis of the head 4. The outer edges 10 arelonger than the inner edges, due to the upward inclination of thepressing surfaces 7. At the center of the head the curved wings join andmerge to form a wedge-shaped member or hub 11, the lower edge of whichis reverse-curved, as shown in Fig. 3.

The operation of the device is as follows: The material to be molded isplaced in the mold, nearly but not quite filling it, the quantity ineach case depending upon the size of the block and core and upon thenature of the material being used. The head is then forced through theopening 3 and rotated, the lower edges 9 of the curved wings cuttingdown through the material, and the working faces of the curved wingsforcing the material radially outward, while the upwardly and outwardlyinclined pressing surfaces 7 allow the material to pass easily from thecenter to the outside of the pressing surface.

The shell 6 prevents loose material from falling in upon the top of thehead, and also enables the head to be withdrawn after the packingoperation is completed, without displacing the material. The lower edges9 of the wings being in the same plane and at right angles to thespindle 5, all of the material is cleaned out down to the bottom of themold and is forced into the compacted mass 12 of the molded block.

By the means above described I have produced a device for makingconcrete blocks that forms a smooth, even hole through the block, packsthe material uniformly clear to the corners of the mold, and forces itup-v ward against the top of the mold, thereby rendering it unnecessaryto tamp the top of the block as has heretofore been common.

I have found in practice that the operation of this device producessulficient pressure outwardly and upwardly to properly pack the concretemixture, the top of the block being as thoroughly compacted as the lowerpart.

Having described my invention, what I claim and desire to secure byLetters Patent, 1s

1. In combination with a mold having a cover tightly secured thereto,said cover formed with a hole, a revoluble longitudinally movablepacking device adapted to be inserted into the mold through the hole,said device comprising a cylindrical head, a pair of curved radiallydisposed wings secured to the lower face of said head, the lower edgesof said Wings lying in a plane at rightangles to the axis of the head,and a pressing surface formed on the lower face of said head, saidpressing surface being inclined from the base of said wings upwardly andoutwardly.

2. In combination with a mold having a cover tightly secured thereto,said cover formed with a hole, a revoluble longitudinally movablepacking device adapted to be inserted into the mold through the hole,said device comprising a cylindrical head, an outwardly and upwardlytapered cylindrical shell carried thereby, a pair of curved radiallydisposed wings secured to the lower face of said head, the lower edgesof said wings lying in a Y lane at right angles to the axis of the heat,and a pressing surface formed on the lower face of said head, saidpressing surface being inclined from the base of said wings upwardly andoutwardly.

3. In combination with a mold having a cover tightly secured thereto,said cover formed with a hole, a revoluble longitudinally movablepacking device adapted to be inserted into the mold through the hole,said device comprising a cylindrical head, and means carried by saidhead to deflect material radially outward when said head is revolved,and a cylindrical shell carried by said head and extending upwardlytherefrom.

In testimony whereof, I afiix my signature in presence of two witnesses.

HERBERT G. ROUNDS. Witnesses:

JOHN MILLER, LEWIS I-IERBISON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

